W.P. 3 - Technologies state of the art W.P. 3 - Technologies state of the art
Work Package number: 3 Starting date: 1st Month of the Project

Partners participating in the Work Package as Task leaders or additional partners:

Partner-country-flag  RINA Industry S.p.A. (RINA)
Partner-country-flag  Norwegian University of Science & Technology (NTNU)
Partner-country-flag  National Renewable Energy Laboratory (NREL)
Partner-country-flag  Fraunhofer Institute for Wind Energy and Energy System Technology (IWES)

This WP will analyse the state of the art of current offshore RE converters and platform technologies as they are being used in the three sectors: the oil and gas industry, in offshore wind and in ocean energy. The analysis will cover structural requirements and designs of the different technical solutions and describe realised systems, including demonstration and pilot projects. Lessons learned from these projects will be provided.

Description of work:

This work package is divided into 4 tasks:

  • 3.1 Benchmark Wind Energy, Ocean Energy, Oil & Gas (RINA)
  • 3.2 Moorings (NTNU)
  • 3.3 Grid Integration (ECN)
  • 3.4 Design tools & Standards (IWES)

3.1 Benchmark Wind Energy, Ocean Energy, Oil & Gas
This task will analyse the state of the art of current offshore Renewable Energy converters and platform technologies as they are being used in the three sectors: the oil and gas industry (o. & g.), in offshore wind energy and ocean energy.

3.2 Moorings
In addition to the structure itself an important technical and economical aspect for the application in wind and wave energy is the mooring design and the corresponding motion of the structure. For wind turbines a certain amount of motion is acceptable, but many wave energy concepts are based on a particular motion of the floats with the waves in order to absorb energy. A mooring system must be designed with respect to the ocean environment (waves, current and wind), water depth and sea floor characteristics (rock, soil, sand). The mooring system is essential for maximum energy production under normal environmental conditions, but also for survival of extreme condition during the design lifetime. Mooring designs will be included as a section in the benchmark studies, which are deliverables of this WP.

3.3 Grid integration aspects
Another technical aspect is the grid connection and grid integration of deep offshore farms. There are a number of technical aspects to be evaluated such as the use of flexible cables and sub sea switchgears as they are planned to be used in very first pilot installations. Recent grid integration studies which were realised in many European countries such as Ireland, UK, Denmark, Netherlands, Germany and others will be reviewed and conclusions will be developed for the roadmap under WP5. Grid integration strategies in progress in the US and Canada will integrated.

3.4 Design tools & Standards
For the design of offshore structures a number of methodologies are applied ranging from modelling and simulation techniques to the design codes and best practices. Existing design guidelines will be reviewed and evaluated on “if and how” to apply them for Renewable Energy Conversion platforms. Similar work which is being undertaken by e.g. IEC will be fed into the project through the various members who are active in the IEC TC88 and TC114, but also in the IEA implementing agreements for wind (especially Annex 23) and ocean energy systems (IEA OES).

  • 1st Workshop: "The potential for Energy Conversion Platforms in Europe: resources, technologies and state of the market"
  • State of research and state of the art report finalised. Benchmark studies (energy converters and platform technologies) completed.